From Longman Dictionary of Contemporary Englishbackhandback‧hand /ˈbækhænd/ noun [countable usually singular] 
DSa way of hitting the ball in tennis and some other games, in which the back of your hand is turned in the direction of the ball when you hit it → forehand —backhand adjective
DSa way of hitting the ball in tennis and some other games, in which the back of your hand is turned in the direction of the ball when you hit it → forehand —backhand adjectiveExamples from the Corpus
backhand• Graf saved eight game points and Sanchez Vicario forced five break points before netting an easy backhand.• Tennis babe Anna Kournikova delivers a series of magnificent backhands to her fiance's baseline on a hotel balcony.• Once she double-faulted, twice she missed with backhands and once Henin made a great attack at the net. 